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New Features of AMD's 45-nm 'Shanghai' Processor
by Scott Ferguson
Performance
—45-nm with Immersion Lithography—Greater frequency compared with Quad-Core AMD Opteron
Performance
—AMD Memory Optimizer Technology—Enhanced pre-fetching 2x Core Probe Bandwidth compared with Quad-Core AMD Opteron
Performance
—AMD Balanced Smart Cache—8MB: Twice the total cache compared with Quad-Core AMD Opteron
Performance
—HyperTransport Technology 3.0—Level 1 up to 17.6GB per second (not available until the second quarter of 2009)
Power Efficiency
—45-nm with Immersion Lithography—35 percent lower idle power compared with Quad-Core AMD Opteron
Power Efficiency
—AMD Smart Fetch—Up to 21 percent CPU power savings
Virtualization
—Enhanced RVI—Faster world switch compared with Quad-Core AMD Opteron
RAS
—L3 Cache Index Disable—Superior data integrity
AMD has used a common platform for its x86 chips, from the quad-core "Barcelona" and "Shanghai" to the six-core "Istanbul" and "Sao Paulo" chips.
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AMD’s 45-nm quad-core Opteron processor, formerly known as "Shanghai," contains some notable advances over its predecessor, the 60-nm Barcelona. The AMD Shanghai is the first AMD chip built on the company's 45-nanometer manufacturing process, and chips in this series will have higher clock speeds, larger Level 3 cache sizes and better power efficiency compared with the previous generation of 65-nm Opteron processors. The first of these 45-nm Opteron processors is slated for two- and four-way systems. New 45-nm processors for single-socket servers and desktops will follow in 2009.